# Dike-0.0.3 **URL:** \ **Category:** Ruby\ **Created:** [September 29, 2007, 8:44pm UTC](https://www.ruby-forum.com/t/dike-0-0-3/115882 "2007-09-29T20:44:47Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\ **Post date:** [September 29, 2007, 8:44pm UTC](https://www.ruby-forum.com/t/dike-0-0-3/115882/1 "2007-09-29T20:44:47Z")
NAME dike SYNOPSIS a simple memory leak detector for ruby with preconfigured rails hooks. INSTALL gem install dike URIS [http://www.codeforpeople.com/lib/ruby/](http://www.codeforpeople.com/lib/ruby/) [http://rubyforge.org/projects/codeforpeople/](http://rubyforge.org/projects/codeforpeople/) DESCRIPTION the concept behind dike.rb is simple: class Object is extended in order that the location of each object’s creation is tracked. a summarizer command is given to walk ObjectSpace using each object’s class and the location if it’s creation to detect memory leaks. not all leaks can be detected and some that are may not really be leaks, but dike provided a simple way to see the hotspots in your code that may potentially be leaking. EXAMPLES ### PURE RUBY ``` ## just dumping sequential snapshots to stderr # cfp:~ > cat sample/a.rb require 'dike' Leaks = Array.new loop do Leaks << String.new('leak' * 1024) Dike.finger sleep 1 end # cfp:~ > ruby sample/a.rb | less ... - class: String count: 2 trace: - sample/a.rb:6 - sample/a.rb:5:in `loop' - sample/a.rb:5 ... - class: String count: 10 trace: - sample/a.rb:6 - sample/a.rb:5:in `loop' - sample/a.rb:5 ... - class: String count: 42 trace: - sample/a.rb:6 - sample/a.rb:5:in `loop' - sample/a.rb:5 ## dumping sequential snapshots using Dike.logfactory and then ``` using the ‘dike’ command line tool to do comparisons of the dumped snapshots ``` # cfp:~ > cat sample/b.rb require 'dike' Leaks = Array.new class Leak def initialize @leak = 42.chr * (2 ** 20) end end Dike.logfactory './log/' Dike.finger 3.times{ Leaks << Leak.new } Dike.finger 2.times{ Leaks << Leak.new } Dike.finger # cfp:~ > ruby sample/b.rb # cfp:~ > ls log/ 0 1 2 # cfp:~ > dike log/ --- - class: Leak count: 3 trace: - sample/b.rb:15 - sample/b.rb:15:in `times' - sample/b.rb:15 - class: Leak count: 2 trace: - sample/b.rb:19 - sample/b.rb:19:in `times' - sample/b.rb:19 # cfp:~ > dike log/0 log/1 --- - class: Leak count: 3 trace: - sample/b.rb:15 - sample/b.rb:15:in `times' - sample/b.rb:15 # cfp:~ > dike log/1 log/2 --- - class: Leak count: 2 trace: - sample/b.rb:19 - sample/b.rb:19:in `times' - sample/b.rb:19 ``` ### RAILS ``` # cfp:~ > cat ./config/environment.rb ... require 'dike' Dike.on :rails # cfp:~ > ./script/server # cfp:~ > curl --silent http://localhost:3000 >/dev/null # cfp:~ > cat ./log/dike/0 --- - class: String count: 90769 trace: [] - class: Array count: 18931 trace: [] - class: Class count: 2 trace: - votelink.com/public/../config/../lib/widgets.rb:222:in ``` `class_factory' - votelink.com/public/../config/../lib/widgets.rb:220:in `each’ - [votelink.com/public/../config/../lib/widgets.rb:220:in](http://votelink.com/public/../config/../lib/widgets.rb:220:in) `class_factory' - votelink.com/public/../config/../lib/widgets.rb:248:in `Widget’ - [votelink.com/public/../config/../lib/widgets/page/base.rb:1](http://votelink.com/public/../config/../lib/widgets/page/base.rb:1) - [votelink.com/public/../config/../lib/widgets.rb:31:in](http://votelink.com/public/../config/../lib/widgets.rb:31:in) `require' - votelink.com/public/../config/../lib/widgets.rb:31:in `load’ - [votelink.com/public/../config/../lib/widgets.rb:16:in](http://votelink.com/public/../config/../lib/widgets.rb:16:in) `for_controller' - votelink.com/public/../config/../lib/widgets.rb:243:in `widget’ - [votelink.com/public/../config/../app/controllers/](http://votelink.com/public/../config/../app/controllers/) application.rb:150 … ``` # cfp:~ > curl --silent http://localhost:3000 >/dev/null # cfp:~ > cat ./log/dike/1 --- - class: String count: 100769 trace: [] - class: Array count: 19931 trace: [] - class: Class count: 5 trace: - votelink.com/public/../config/../lib/widgets.rb:222:in ``` `class_factory' - votelink.com/public/../config/../lib/widgets.rb:220:in `each’ - [votelink.com/public/../config/../lib/widgets.rb:220:in](http://votelink.com/public/../config/../lib/widgets.rb:220:in) `class_factory' - votelink.com/public/../config/../lib/widgets.rb:248:in `Widget’ - [votelink.com/public/../config/../lib/widgets/page/base.rb:1](http://votelink.com/public/../config/../lib/widgets/page/base.rb:1) - [votelink.com/public/../config/../lib/widgets.rb:31:in](http://votelink.com/public/../config/../lib/widgets.rb:31:in) `require' - votelink.com/public/../config/../lib/widgets.rb:31:in `load’ - [votelink.com/public/../config/../lib/widgets.rb:16:in](http://votelink.com/public/../config/../lib/widgets.rb:16:in) `for_controller' - votelink.com/public/../config/../lib/widgets.rb:243:in `widget’ - [votelink.com/public/../config/../app/controllers/](http://votelink.com/public/../config/../app/controllers/) application.rb:150 … ``` # cfp:~ > dike ./log/dike ... - class: Class count: 3 trace: - votelink.com/public/../config/../lib/widgets.rb:222:in ``` `class_factory' - votelink.com/public/../config/../lib/widgets.rb:220:in `each’ - [votelink.com/public/../config/../lib/widgets.rb:220:in](http://votelink.com/public/../config/../lib/widgets.rb:220:in) `class_factory' - votelink.com/public/../config/../lib/widgets.rb:248:in `Widget’ - [votelink.com/public/../config/../lib/widgets/page/base.rb:1](http://votelink.com/public/../config/../lib/widgets/page/base.rb:1) - [votelink.com/public/../config/../lib/widgets.rb:31:in](http://votelink.com/public/../config/../lib/widgets.rb:31:in) `require' - votelink.com/public/../config/../lib/widgets.rb:31:in `load’ - [votelink.com/public/../config/../lib/widgets.rb:16:in](http://votelink.com/public/../config/../lib/widgets.rb:16:in) `for_controller' - votelink.com/public/../config/../lib/widgets.rb:243:in `widget’ - [votelink.com/public/../config/../app/controllers/](http://votelink.com/public/../config/../app/controllers/) application.rb:150 … NOTES - the ‘Dike.finger’ method dumps it’s log in a format showing - loading into a rails environment causes snapshots of the above format to be dumped into RAILS\_ROOT/log/dike/ after each request. each snapshot is incrementally numbered 0, 1, … - the ‘dike’ command line tool can be used in two ways - options that affect logging LIMITATIONS not all object creation can be tracked. not all leaks are reported. some reported leaks are not. dike shows you where in the source objects are being created that cannot be reclaimed - these are not always leaks as this line ``` class C; end ``` shows. the class ‘C’ cannot be reclaimed and is not a leak. AUTHOR ara [dot] t [dot] howard [at] gmail [dot] com enjoy. a @ [http://drawohara.com/](http://drawohara.com/) ---
**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\ **Post date:** [October 1, 2007, 3:25am UTC](https://www.ruby-forum.com/t/dike-0-0-3/115882/2 "2007-10-01T03:25:22Z")
On Sun, 30 Sep 2007 03:43:32 +0900, ara.t.howard wrote: > dike Hey, ara, what’s new? ---
**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\ **Post date:** [October 1, 2007, 4:59am UTC](https://www.ruby-forum.com/t/dike-0-0-3/115882/3 "2007-10-01T04:59:02Z")
On Sep 30, 2007, at 7:25 PM, Jay L. wrote: > Hey, ara, what’s new? touche teacher. touche. a @ [http://drawohara.com/](http://drawohara.com/) ---
**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\ **Post date:** [October 1, 2007, 5:55am UTC](https://www.ruby-forum.com/t/dike-0-0-3/115882/4 "2007-10-01T05:55:43Z")
On Mon, 1 Oct 2007 11:58:30 +0900, ara.t.howard wrote: > > Hey, ara, what’s new? > > touche teacher. touche. No, I mean, really… what’s new? There’s no changelog. ---
**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\ **Post date:** [October 1, 2007, 11:32pm UTC](https://www.ruby-forum.com/t/dike-0-0-3/115882/5 "2007-10-01T23:32:44Z")
On Sep 30, 2007, at 9:55 PM, Jay L. wrote: > No, I mean, really… what’s new? There’s no changelog. sorry. - few small bug fixes, nothing functional though - made installation into rails require and i thought you were being so clever. cheers. a @ [http://drawohara.com/](http://drawohara.com/)